Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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">100_) de Centro gravitatis parabolæ & </
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boliformis verba fiunt, intelligantur non curvæ lineæ,
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ſed iis comprehenſa ſpatia, de quibus apparet iſthic agi.</
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tur termini rationem exprimentes, quam habet circuli di-
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ameter ad ejus circumferentiam.</
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